Adjustable lens device

Abstract

An adjustable lens device includes a fixing seat, an adjusting seat sleeved on the fixing seat, and first and second lens modules mounted to the fixing seat. The fixing seat is formed with a plurality of positioning projections, and a plurality of guide slots that extend parallel to an axis. The adjusting seat is formed with an annular groove for movably receiving the positioning projections, and a plurality of driving slots that extend spirally and that correspond to the guide slots. Guide components on the second lens module pass through the guide slots and the driving slots. By virtue of the guide slots, the driving slots and the guide components, rotation of the adjusting seat relative to the fixing seat can move the second lens module for zoom adjustment.

1. An adjustable lens device comprising:
 a tubular fixing seat having a surrounding wall that surrounds an axis and that defines a through hole, said surrounding wall having a first end portion, a second end portion opposite to said first end portion along the axis, a guide slot formed between said first and second end portions and extending parallel to the axis, and a positioning projection projecting radially and outwardly from said surrounding wall; 
 a tubular adjusting seat sleeved on said fixing seat, said adjusting seat being formed with a driving slot that extends spirally relative to the axis and having an annular inner surface formed with an annular groove, said positioning projection being movably received in said annular groove so as to couple rotatably said adjusting seat to said fixing seat, said adjusting seat further having an end face formed with a notch that extends parallel to the axis, that extends to said annular groove and that permits movement of said positioning projection into and out of said annular groove; 
 a first lens module mounted to said first end portion of said surrounding wall of said fixing seat, said first lens module including a first lens barrel and a set of first lenses mounted in said first lens barrel; and 
 a second lens module mounted in said second end portion of said surrounding wall of said fixing seat, said second lens module including a second lens barrel, a set of second lenses mounted in said second lens barrel, and a guide component provided on said second lens barrel and passing through said guide slot in said fixing seat and said driving slot in said adjusting seat such that rotation of said adjusting seat relative to said fixing seat results in movement of said guide component along said guide slot and said driving slot to result in movement of said second lens module relative to said fixing seat along the axis. 
 
   
   
     2. The adjustable lens device as claimed in  claim 1 , wherein said fixing seat further has a fixing portion projecting in radial outward directions from said surrounding wall and spaced apart from said positioning projection along the axis. 
   
   
     3. The adjustable lens device as claimed in  claim 2 , wherein said adjusting seat further has a positioning end portion disposed adjacent to said fixing portion, and an operating end portion opposite to said positioning end portion along the axis, said driving slot being formed between said positioning end portion and said operating end portion, said positioning end portion being formed with said annular groove and said notch. 
   
   
     4. The adjustable lens device as claimed in  claim 1 , wherein said first end portion of said surrounding wall of said fixing seat has an inner wall surface formed with an internal thread, said first lens barrel of said first lens module extending into said through hole of said fixing seat and being formed with an external thread to connect threadedly with said internal thread on said first end portion of said surrounding wall. 
   
   
     5. The adjustable lens device as claimed in  claim 4 , wherein said fixing seat further has a limiting portion extending parallel to the axis from said first end portion of said surrounding wall, said limiting portion having a first limiting edge and a second limiting edge that form an angle therebetween relative to the axis, said first lens module further including a limiting component provided on said first lens barrel and cooperating with said first and second limiting edges of said limiting portion to limit range of angular rotation of said first lens module relative to said fixing seat. 
   
   
     6. The adjustable lens device as claimed in  claim 5 , wherein said limiting portion is in a form of a plate, and said limiting component is a screw. 
   
   
     7. The adjustable lens device as claimed in  claim 1 , wherein:
 said first lens module further includes at least one first spacer ring disposed between an adjacent pair of said first lenses, and a first press ring mounted in said first lens barrel for limiting said first lenses along the axis; and 
 said second lens module further includes at least one second spacer ring disposed between an adjacent pair of said second lenses, and a second press ring mounted in said second lens barrel for limiting said second lenses along the axis. 
 
   
   
     8. The adjustable lens device as claimed in  claim 1 , wherein said first lens module is a front optical lens module, and said second lens module is a rear optical lens module.